Warm Audio WA-47 Manual De Instrucciones página 5

A LOOK INSIDE THE WA-47
The Capsule
The WA-47 utilizes a custom reproduction of the vintage 47-style (K47) capsule that was used in
the classic '47 microphone - designed with the same hole pattern and frequency response. Our
version of this capsule (model# WA-47-B-80v) is carefully manufactured by an Australian capsule
supplier and is precisely reproduced to the vintage specs. We are pleased to offer a legitimate
47-style capsule re-incarnation because it allows us to nail the sonics of the most important piece
of the classic '47 formula.
The Tube
A Slovak Republic JJ 5751 vacuum tube is a low gain, low noise tube that forces much of
the sonics of the capsule and transformer in the WA-47 to be heard more significantly than
high gain tubes might allow. The transformer and capsule in the vintage '47 mics are very
critical to the classic tone and we found this particular tube to really allow these 2
components to be accentuated. We auditioned 4 different tube brands and fell in love with the
JJ 5751. The frequency response of the JJ tube, and the way it contributes to the circuit is smooth
and vintage in nature. We found this tube gave us the essence of the vintage '47 tube circuit
without electrically mirroring the original VF14 steel tube that is no longer available.
The Transformer
The WA-47 utilizes an American made TAB-Funkenwerk (AMI) USA transformer with large core
imported German laminations. This transformer helps provide the creamy smooth top end and
the LARGER THAN LIFE bottom end one would expect from a 47-style microphone.
The Cable
One component of a tube microphone that is often overlooked is the 7 pin cable that connects the
microphone to its power supply. When auditioning the WA-47 and other tube microphones we
learned quite a bit about 7 pin cables and how the shielding and wire gauge size can change
the sonics. We have partnered with Gotham Audio in Switzerland to use their very carefully built
high-end 7 pin "GAC-7 cable". Using this cable increases top end presence and the overall size
of the recorded image in the stereo field by reducing phase shift and the parasitic effect often
experienced in poorly built cables. Gotham Audio Cabling is very expensive and boutique in
nature and shouldn't be considered a small addition to the WA-47 package.
The Capacitors
The WA-47 proudly uses a polystyrene coupling capacitor, wima film capacitors throughout, and
an imported Solen French capacitor on its output.
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